[9.x] Add --name option to schedule:test command

[ziadoz]

It would be handy to be able to schedule commands for testing using their name, rather than having to choose from a list, as often I'm looking to run a specific command, and the list numbers change as new commands are added to the schedule. This PR adds an optional --name option to schedule:test to make that possible.

It works by matching the end of the strings contained in $commandNames, which looks like this:

  0 => "'/usr/local/bin/php' 'artisan' my:cmd-1"
  1 => "'/usr/local/bin/php' 'artisan' my:cmd-2"
  2 => "named-cmd-1"
  3 => "named-cmd-2"
  4 => "App\Commands\ClassCmd"

So --name=my:cmd-1 would match 0, --name=named-cmd-2 would match 3, and --name=ClassCmd would match 4. If there isn't an exact match then an error is returned.

I couldn't see a test class for this command, so I haven't added any additional test cases, but if someone points me in the right direction I'll happily add them. Thanks.